Joining method on a jet spinning machine, spinning device and jet spinning machine

Abstract

A joining method wherein fibers of a fiber band are wound around an auxiliary thread threaded into a spinning device and drawn through a spinning cone. The newly spun thread is separated from the auxiliary thread and connected to the end of an upper thread. A spinning device is provided for a jet spinning machine for carrying out such method, comprising a first clamping device for temporary clamping of the upper thread and a second clamping device for temporary clamping of the auxiliary thread. A jet spinning machine for carrying out the method has a mechanism for storing the auxiliary thread and the newly spun thread, a mechanism for separating the auxiliary thread from the newly spun thread, and a splicing mechanism for connecting the newly spun thread to the upper thread, all arranged only on at least one operating carriage displaceable along multiple spinning stations.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application claims the benefit of German patent application 10 2005 022 187.4, filed May 13, 2005, herein incorporated by reference.BACKGROUND OF THE INVENTION[0002]The invention relates to a joining method on a jet spinning machine, as well as a spinning device and a jet spinning machine for carrying out the joining method.[0003]Jet spinning machines generally comprise spinning devices, to which a fibre band drawn to a fibre bundle is supplied from a drawing frame. The fibre band runs through a spinning nozzle, in which it is acted upon by swirling air currents and is thereby provided with a true torsion or true twist. Positioned downstream from the spinning nozzle is a hollow spinning cone, through which the fibre band is drawn off as a thread from an outlet opening and then wound onto a take-up bobbin as the upper thread.[0004]German Patent Publication DE 3611050 A1 describes a spinning unit, which is intended to produce bobbins ...

AI Technical Summary

Benefits of technology

[0013]The invention allows a simple threading in of a joining thread and reduces the number of unsuccessful joining attempts. The yarn character can be better influenced. If a splicing connection is selected, only a splice connection which is practically identical to the yarn remains in the finished yarn which leads to no reduction in quality of the finished product.

[0014]If the auxiliary thread differs with respect to its properties from the remaining thread, the auxiliary thread can be selected such that a better threading in is achieved with it. Particularly suitable is an auxiliary thread, which is stiffer and / or smoother than the remaining thread. It may also be advantageous if the auxiliary thread is stronger or finer than the remaining thread.

[0015]Compared with the method of introducing the end of an upper thread counter to the normal thread running direction during spinning operation, into the spinning device, before joining takes place, the use of an auxiliary thread allows a significant improvement in insertion. In particular, an improvement is to be noted, if instead of introducing only a fibre bundle in the normal thread running direction during spinning operation into the spinning device, an auxiliary thread is used before joining takes place.

[0016]In order to reduce the occurrence of errors in joining, the auxiliary thread is introduced into the spinning device in two stages. In this case, in a first stage, the auxiliary thread is introduced into the fibre band channel prior to the spinning nozzle mechanism by means of the injector flow and, in a second stage, the auxiliary thread is introduced into the spinning cone by acting upon the spinning cone by means of reduced pressure. For the introduction of the auxiliary thread, the spinning nozzle mechanism and the spinning cone are temporarily placed so far apart from one another that the auxiliary thread can be manually grasped between the spinning nozzle mechanism and the spinning cone. This allows threading to be carried out in a simple manner, substantially manually. However, it is also possible to automate the handling, at least partially.

[0017]If, during joining, a joining speed is adjusted, which is lower than the speed during normal spinning operation, the risk of disruptions of the joining process occurring can be reduced.

[0021]These components may be stationarily arranged at the spinning station of the jet spinning machine. Alternatively, with a large number of spinning stations at the jet spinning machine, these components may be exclusively arranged at least one operating carriage which can be displaced along the spinning devices of the jet spinning machine. The outlay for construction at the jet spinning machine can thus be reduced.

Problems solved by technology

The spinning unit of German Patent Publication DE 3611050 A1 is not suitable for producing a spun thread with a true twist.

Inserting the auxiliary threads according to the disclosure of German Patent Publication DE 3611050 A1, from the side, is not possible when using jet spinning devices, which operate with a twist retaining mechanism and a hollow spinning cone.

During this preparation phase for thread connection, errors frequently occur which disturb the formation of a thread connection or even prevent it.

A further disadvantage is that the thread portion, which contains the connection between the upper thread and thread bundle is clearly recognisably thicker than the remaining thread.

A thick location of this type has a disruptive effect in the end product, for example a woven fabric and is a quality defect.

Apart from the disadvantage that the thread connection process is frequently unsuccessful, the length of the thread portion, which forms the piecer can hardly be controlled.

The limitation of the bore diameter leads decisively to limitations in the influencing of the yarn character.

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